About Google Emojis
Google emoji images are used on stock Android devices (such as Pixel phones), Gmail Web Interface, Google Hangouts, and ChromeOS. These are provided as part of the Noto Emoji project. As of 2018, these images are also used on in Slack on non-Apple platforms such as Windows, Linux, and Android.
Platform vendors such as Samsung, LG and HTC use some or all of their own emoji images. Apps such as WhatsApp and Facebook use their own emoji images, while Signal and Telegram for Android use Apple emoji images.